I've been looking into this but still I have not managed to get my own USB headset working...
I'm not sure if this is useful any more after the introduction of pulse audio
Do
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grep audio /etc/group
You probably get audio:x:29:pulse
For some sound problems it may help if you are in the audio group
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gksu gedit /etc/group
Add your username to the line above so it becomes like
audio:x:29:pulse:username
Be
very careful not to change anything else or your computer may become unusable
You could also do
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cat /proc/asound/modules
You may get something like
0 snd_intel8x0
1 snd_hda_intel
2 snd_usb_audio
and you want the USB audio to be the default, then
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gksu gedit /etc/modeprobe.d/alsa-base.conf
At the end add
options snd_usb_audio index=0
options snd_hda_intel index=1
options snd_intel8x0 index=2
This makes usb_audio the default (I'm investigating this more right now)